You can read more about it here.
See if you can't figure out how many mana total, and which specific kinds, it takes to summon the following card: The Answer: The first card, (Sylvan Bounty), costs 5 generic manamana of any kind you want along with one green manamana produced by a forest, for a total of six mana
While the Frog Token may not be a competitive powerhouse on its own, cards like Emrakul, the Promised End or Primeval Titan might provide stronger effects for the same mana cost in a more competitive setting
However, in Commander, no such bans existed, and this card is generally a bit player in dedicated Cat builds
This means if youre told you may cast a card from the top of your library, but that card turns out to be a land, you are not actually able to do anything with it after all
I recommend to take a look at it